Extruded Aluminum Backdraft Damper

Aluminum (1⅝” x 6″ x 1⅝”) Frame
Flanged (2″ x 4″ x ⅝”) Frame
Steel (Channel or Flange) Frame
Variety of Bird or Insect Screens
Linkage Out of Airstream
Polyurethane or Neoprene Jamb Seals
Oilite Bronze or Ball Bearings
Counterweights – adjustable for infinite opening pressures in optional locations. Specify if airstream is horizontal, vertical up or down. Specify to assist or resist
opening. Specify locations internally (on blades) or externally (on external shaft).

Model:	655
Minimum Panel Size:	8″ x 8″
Maximum Panel Size:	48″ x 72″
Frame Depth:	4″
Frame Material:	.081″ Thick Extruded Aluminum Alloy
Frame Type:	Channel
Blade Type:	Overlapping Edges for Strength and Low Leakage
Blade Material:	.081″ Thick Extruded Aluminum Alloy
Blade Action:	Parallel
Blade Seals:	Silicone Rubber Off-Set Leg
Shaft:	½” Diameter Extruded Aluminum Pin Lock Design
Jamb Seals:	None
Bearings:	Celcon
Linkage:	Face Mounted (In Airstream)
Temperature Limits:	-40°F to 190°F
Finish:	Mill

*Dampers smaller than minimum frame size require transitions.

Description

FRAME: .081″ and .125” thick (nominal) 6063-T52/T6 extruded aluminum alloy. 1″ x 4″ x 1″ channel frame on all sides.
BLADES: .081″ thick (nominal) 6063-T52/T6 extruded aluminum alloy, designed for strength and low leakage with overlapping edges.
AXELS: ½” dia. extruded aluminum pin-lock design.
BLADE SEALS: Silicone rubber off-set leg at blade edges. None at jambs.
BEARINGS: Celcon bearing material so that there will be no metal to metal friction.
LINKAGE: Face mounted in the airstream.
FINISH: Mill standard, optional finishes available.
TEMP. LIMITS: -40°F to +190°F